比较俩个二维数组，返回差集

/**
     * 比较俩个二维数组，返回差集
     */
    public static function compareFile($dir_name_new,$dir_name)
    {
        ini_set('memory_limit', '-1');

        $md5_folder_new = Finance::md5_folder($dir_name_new);
        $md5_folder = Finance::md5_folder($dir_name);

        if($md5_folder_new == $md5_folder){
            return [];
        }else{
            $new_files = Finance::getFiles($dir_name_new);
            $new_data = [];

            $files = Finance::getFiles($dir_name);
            $data = [];

            foreach ($new_files as $file) {
                $val['file_name'] = $file;
                $val['md5_file'] = md5_file($dir_name_new.$file);
                $new_data[] = $val;
            }

            foreach ($files as $file) {
                $val['file_name'] = $file;
                $val['md5_file'] = md5_file($dir_name.$file);
                $data[] = $val;
            }

            $result = array_filter($new_data, function($v) use ($data) {
                return ! in_array($v, $data);
            });
            return $result?array_column($result, 'file_name'):[];
        }
    }